CPP water-wave python capillary-gravity-wave 人生 Leetcode bessel-functions hexo-stellar levi-civita exterior-algebra 诗词 continuity-equation euler-equations hankel-transform ray-theory mathjax latex special-functions gamma-and-zeta tensor-calculus dyadic-product vector-calculus gaussian-integrals fourier-analysis bessel-and-hankel hodge-star metric-tensor 春物 eulerian-lagrangian-descriptions hydraulic-jump azimuthal-fourier ladder-operators functional-analysis PINN academic-eng cpp-debug python-lambda eulerian-and-lagrangian bi-laplacian axisymmetric-PDE stationary-phase dispersion-relation water-waves contour-integrals envelope-geometry wave-action froude-number fourier-transform residue-theorem complex-analysis wave-patterns capillary-gravity-waves